Furnace.



P. L. BRDMLEY.

FURNACE.

APPLICATION PIYLBD D110. 22, 1910.

Patented June 10,1913.

3 H 0 2 ww Z X W W W F. L. BROMLEY.

FURNACE.

APPLICATION 31mm D30. 22, 1910.

1,064,439, Patented June 10,1913.

2 SHEETS-SHEET 2.

UNITED STATES PA TENT OFFICE.

FRANK L. BROMLEY, OF'DETROI'I, MICHIGAN, ASSIGNOR TO DETROIT STOKER COMPANY, OF DETROIT, MICHIGAN, A CORPORATIONOF MICHIGAN.

FURNACE.

Specification of Letters Patent.

Patented June 10, 1913.

Application filed December 22, 1910. Serial No. 598,839.

To all whom it may concern:

Be it known that I, FRANK L. BROMLEY, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Furnaces, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to furnaces of that type in which a refractory arch covers the furnace chamber and is supported by metallic members at the opposite sides thereof; With furnaces of this type which are frequently used in connection with automatic stokers, it is customary to form the metallic supports for the arch integral with the metallic wall of the fuel magazine. To guard against overheating, air passages are formed adjacent to the metallic member, the heated air being discharged into the furnace to aid in combustion, but it has been found in practice that the cooling effect is insufficient to revent the frequent burning out of the arcli supporting members. Another serious defcct in the construction is that the unequal expansion of the metal and the refractory arch will set up stresses frequently resulting in the fracturing of the arch.

It is the object of the invention to provide means for compensating for the unequal expansion of the metal and the re fractory material, and also to obtain a construction in which the arch supporting members are separate from, but attachable to the main metallic members forming the walls of the magazine. This permits of renewing the arch support whenever necessary, and by forming these detachable arch supporting members in short sections slightly spaced from each other, the double purpose is accomplished of providing for independent expansion and permitting of the removal of a single section in place of thewall arch supportin series.

The invention there ore consists in the construction as will be more fully hereinafter described.

In the drawings, Figure 1 is a sectional perspective view of a portion of a furnace to which my improvements are applied; Fig. 2 is a cross section through the fuel magazine and arch supporting member showing a slightly modified construction of the latter; and Fig. 3 is a perspective view of a portion of the magazine wall and one of the arch supporting sections detached.

A is a magazine of a self-stoking furnace of any suitable construction and which has the metallic member B forming the inner wall thereof, G is the fuel pusher resting upon a shelf D, and E and F are the inner and outer walls of a hollow refractory arch. an air space G being formed between said walls.-

As heretofore constructed, the arches E and F have been supported upon abutments integral with the plate B, and notwithstanding the fact that these abutments are cooled by air currents they frequently become highly heated. This is particularly the case with the abutment for the lower arch E which is directly exposed to the heat of the furnace chamber. In the present construction, the lower arch E is supported upon detachable abutments I ,whlch are formed in short lengths and so fashioned as to have an interlocking engagement with the member B- Thus, as shown in Fig. 3, each abutment section I is provided with upwardly extending prongs J which engage with a pocket or keeper K on the member B. There is also a seat portion L on the member I which engages a ledge M on the member B and into which the stresses developed by the weight of the arch are transmitted. The arch E is supported on the member I so as to form an air space or passage for a cooling current. As shown in Fig. 1, this is accomplished by forming outwardly projecting ribs N on the member I which form seats for the arch and which are provided wit-h lugs N for locking the arch in place.

In the modified construction shown in Figs. 2 and 3, there is a supporting plate N on which the arch directly rests, this plate being spaced by the ribs N to form the air passage, but I deem the construction shown in Fig. l preferable as there is less surface in contact with the arch for the conduction of heat. 7

The members I are arranged end for end in longitudinal series and extend the entire length of the furnace chamber. Instead however, of placing these sections in contact with each other, spaces indicated at O are left between the adjacent ends and these are sufficient to provide for the maximum displacement due to expansion. Thus, each of the sections is permitted to remain in the same relative position to the portion of the arch supported thereby which prevents the development of stresses that would fracture the arch. The arch F is supported on an abutment preferably integral with the member B and which consists of an inclined portion P and an oppositely inclined brace member P. Between these members the triangular space formed is'utilized as an air passage for the cooling current.

With the construction as described in assembling the parts the members J may be engaged by inclining them so as to insert the prongs J into the keeper recesses K and then dropping them to rest the seat L upon the ledge M. If at any time it necessary to renew one or more sections, this may be done without the necessity of tearing down the arch, it being merely necessary to cutaway sufliciently forthe lifting of the section into inclined position and then slipping it out of engagement, after which a new section may be inserted in its place. The abutment for the upper arch F is in the form of a hollow beam and thus serves both to strengthen the supporting portion P on which the arch directly rests and also to brace and strengthen the member 13 so as to assist in carrying the load of the lower arch.

Vhat I claim as my invention is:

1. In a furnace, the combination with a refractory arch, of a fuel magazine at one side thereof, provided with a side wall having an outwardly extending ledge and a downwardly opening pocket positioned above said ledge and an arch abutment having a portion seated on said ledge, and a u portlon pro ecting into the pocket positioned thereabove.

2. In a furnace, the combination with a refractory arch, of a fuel magazine at one side thereof provided with a side wall having an outwardly extending ledge and a plurality of downwardly opening pockets positioned above said ledge, and a plurality of independent arch abutments each having a portion seated on said ledge and a portion projecting upwardly into one of the pockets.

In testimony whereof I aflix my signature in presence of two witnesses.

' FRANK L. BROMLEY.

Witnesses: 1

JAMES P. BARRY, W. J. BELKNAP. 

